Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Detail - Accounts receivable - long term, net (Details)

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Balance Sheet Detail - Accounts receivable - long term, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts receivable - long term    
Total amount due from customer $ 17,549 $ 20,886
Less discount (766) (912)
Less current portion included in accounts receivable, current (11,514) (12,537)
Total of accounts receivable, long term, net $ 5,269 $ 7,437